One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,11)(8,10)(9,12)(14,17)(18,19)(21,22)(23,29)(24,32)(25,26)(27,30)(28,33)(31,35)(34,36) involution — undirected(5,6,8,10)(7,9,12,11)(13,14,16,17)(15,19,20,18)(22,25)(23,30)(24,33)(35,36)(7,12)(9,11)(13,14,16,17)(15,18,20,19)(21,23)(22,27)(24,34)(25,29)(26,30)(28,36)(31,33)(32,35)(1,2,3,4)(5,7)(6,9)(8,12)(10,11)(13,14)(15,18)(16,17)(19,20)(21,24)(22,28)(23,31)(25,32)(26,33)(27,35)(29,36)(30,34)(5,6)(7,9)(8,10)(11,12)(13,15,16,20)(14,18,17,19)(21,25,26,22)(23,29,30,27)(24,32,33,28)(31,36,34,35)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.